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Currently we BUG() if we see an ESR_EL2.EC value we don't recognise. As configurable disables/enables are added to the architecture (controlled by RES1/RES0 bits respectively), with associated synchronous exceptions, it may be possible for a guest to trigger exceptions with classes that we don't recognise. While we can't service these exceptions in a manner useful to the guest, we can avoid bringing down the host. Per ARM DDI 0487A.k_iss10775, page D7-1937, EC values within the range 0x00 - 0x2c are reserved for future use with synchronous exceptions, and EC values within the range 0x2d - 0x3f may be used for either synchronous or asynchronous exceptions. The patch makes KVM handle any unknown EC by injecting an UNDEFINED exception into the guest, with a corresponding (ratelimited) warning in the host dmesg. We could later improve on this with with a new (opt-in) exit to the host userspace. Cc: Dave Martin <dave.martin@arm.com> Cc: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org> Signed-off-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Marc Zyngier <marc.zyngier@arm.com> |
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| .. | ||
| hyp | ||
| debug.c | ||
| guest.c | ||
| handle_exit.c | ||
| hyp-init.S | ||
| hyp.S | ||
| inject_fault.c | ||
| irq.h | ||
| Kconfig | ||
| Makefile | ||
| regmap.c | ||
| reset.c | ||
| sys_regs_generic_v8.c | ||
| sys_regs.c | ||
| sys_regs.h | ||
| trace.h | ||
| vgic-sys-reg-v3.c | ||